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Net Income per Share (Tables) | 12 Months Ended
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Dec. 31, 2014
Net Income per Share [Abstract] |
Reconciliation of numerators and denominators of basic and diluted net income (loss) per share | A reconciliation of the numerators and denominators of the basic and diluted net income per share calculations is as follows (in thousands, except per share data):
| Years Ended December 31,
| 2014 | 2013 | 2012
Numerator: |  |  |  |  |  |  |  |  |
Net income (loss) attributable to AXT, Inc | $ | (1,388 | ) | $ | (7,958 | ) | $ | 3,110 |
Less: Preferred stock dividends |  | (177 | ) |  | (177 | ) |  | (177 | )
Net income (loss) to common stockholders | $ | (1,565 | ) | $ | (8,135 | ) | $ | 2,933 |
Denominator: |  |  |  |  |  |  |  |  |
Weighted average common shares (basic) |  | 32,452 |  |  | 32,700 |  |  | 32,144 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |
Common stock options |  | — |  |  | — |  |  | 689 |
Restricted stock awards |  | — |  |  | — |  |  | 32 |
Weighted average common shares (dilutive) |  | 32,452 |  |  | 32,700 |  |  | 32,865 |
Basic net income (loss) per share: |  |  |  |  |  |  |  |  |
Net income attributable to AXT, Inc | $ | (0.05 | ) | $ | (0.25 | ) | $ | 0.10 |
Net income to common stockholders | $ | (0.05 | ) | $ | (0.25 | ) | $ | 0.09 |
Diluted net income (loss) per share: |  |  |  |  |  |  |  |  |
Net income attributable to AXT, Inc | $ | (0.05 | ) | $ | (0.25 | ) | $ | 0.09 |
Net income to common stockholders | $ | (0.05 | ) | $ | (0.25 | ) | $ | 0.09 |
Options excluded from diluted net income per share as the impact is anti-dilutive |  | 2,772 |  |  | 2,671 |  |  | 1,056 |
Restricted stock excluded from diluted net income per share as the impact is anti-dilutive |  | 252 |  |  | 241 |  |  | 13 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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